I reckon the Electromax is terrific! I've had mine for about 9 months now and it;s already been saving me money, if anyone is lookin to buy one then you should try discounted heating - as far as i know, they do the cheapest ones (and frree delivery!).
I know a lot of people have had a small problem with them, including myself, in which they don't produce enough hot water at times. Luckily theres a very simple solution and all you have to do is make sure the off-peak element is on, apart from that i havnt had any other issues.